import { readFileSync } from 'fs';
import { platform } from 'os';

let __isMeInDocker: boolean = null;

// https://stackoverflow.com/questions/20010199/determining-if-a-process-runs-inside-lxc-docker/20010626
export function isMeInDocker(): boolean {
	if (platform() !== 'linux') {
		return false;
	}
	if (__isMeInDocker === null) {
		__isMeInDocker = readFileSync('/proc/1/cgroup').indexOf('/docker/') !== -1;
	}
	return __isMeInDocker;
}

let colorEnabled: boolean = null;

export function isColorEnabled(): boolean {
	if (colorEnabled === null) {
		if (isMeInDocker() === true) {
			colorEnabled = false;
		} else {
			colorEnabled = process.stderr.isTTY || false;
		}
	}
	return colorEnabled;
}